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A Shape Builder click or drag over a selection of more than 128 segments merged on the UI thread, so the app stopped drawing and answering until the merge was done. The tool now computes such a merge on another thread from the map it built for the hover. Meanwhile the canvas keeps drawing, the touched regions stay highlighted and the pointer is the busy pointer. When the merge is done, the tool runs shapeBuilder.merge with the gesture's params as one undo step, and the command takes the computed shapes when it would compute the same ones. The web build merges in the command, as before. A press while the map is still being built no longer waits for it on the UI thread: the tool records the gesture and makes it once the map is there. Clicks, drags and the Shape Builder's arrow keys made during the merge, and commands, menu items, the app's own dialogs, saves and tool or document switches, run after it on the merged art; engine queries that only read run at once. A change to the selected paths made outside a command drops the merge. The headless host and ui.pointer reply once the merge is applied. The Shape Builder and the Live Paint Bucket keep their map of the selection over a new revision of the document when the selected paths and their outlines are unchanged, instead of building it again.